I understand the -R flag is multiplicatives of the worksize. I have it at 3328. I can get the miner at 3 khs, but it crashes the driver (13.12) after a few minutes. I'll probably need to dial down the engine.
Nfactor 14 = 4Mb per hash if lookup-gap=1 and 0,5Mb if lookup-gap=8
if buffersize=1696 and lookup-gap=8 rawintensity must be = 1696/(4/8)-1 = 3391
try maximum increase buffer size first
then calculate rawintensity for selected lookup-gap
try another lookup-gap
and try this
setx GPU_MAX_HEAP_SIZE 100
setx GPU_FORCE_64BIT_PTR 1
example --lookup-gap 4 -R 1695 -B 1696